diff --git a/.pylintrc b/.pylintrc
index cde3b68..25948a5 100644
--- a/.pylintrc
+++ b/.pylintrc
@@ -1,5 +1,5 @@
 [MESSAGES CONTROL]
-disable=C0111, R0903, R0913, C0330
+disable=C0111, R0903, R0913, C0330, R0902
 
 [FORMAT]
 good-names=i,f
diff --git a/README.md b/README.md
index d74459b..d057f14 100644
--- a/README.md
+++ b/README.md
@@ -44,12 +44,28 @@
 
 The single configuration values are listed here:
 
-| key                | description                         | default value           |
-|--------------------|-------------------------------------|-------------------------|
-| `gerrit.url`       | URL of the Gerrit test server       | `http://localhost:8080` |
-| `gerrit.user`      | Gerrit user used for tests          | `admin`                 |
-| `gerrit.password`  | Password of Gerrit user             | `secret`                |
-| `testrun.duration` | Duration for which to run the tests | `null` (indefinitely)   |
+| key                | description                                                                           | default value           |
+|--------------------|---------------------------------------------------------------------------------------|-------------------------|
+| `gerrit.url`       | URL of the Gerrit test server                                                         | `http://localhost:8080` |
+| `gerrit.user`      | Gerrit user used for tests                                                            | `admin`                 |
+| `gerrit.password`  | Password of Gerrit user                                                               | `secret`                |
+| `testrun.duration` | Duration for which to run the tests                                                   | `null` (indefinitely)   |
+| `actions.*`        | Probability with which an action is performed in each cycle (`0`: never, `1`: always) | `1`                     |
+
+### Available actions
+
+The following actions can be performed by the tests:
+
+| key               | description                                                                              |
+|-------------------|------------------------------------------------------------------------------------------|
+| `clone_project`   | Test performs a clone of a project, that is assigned to the simulated user               |
+| `create_project`  | Test creates a new project via REST                                                      |
+| `fetch_project`   | Test fetches a project, that is assigned to the simulated user and was already cloned    |
+| `push_for_review` | Test creates random commits in a cloned project and pushes them to `refs/for/master`     |
+| `push_to_branch`  | Test creates random commits in a cloned project and pushes them to the remote's `master` |
+| `query_changes`   | Queries changes via REST                                                                 |
+| `query_projects`  | Queries projects via REST                                                                |
+| `review_change`   | Reviews a change via REST                                                                |
 
 ## Run
 
diff --git a/config.sample.yaml b/config.sample.yaml
index 57f4650..0e6f34b 100644
--- a/config.sample.yaml
+++ b/config.sample.yaml
@@ -5,3 +5,21 @@
 
 testrun:
   duration: null
+
+actions:
+  clone_project:
+    probability: 1
+  create_project:
+    probability: 1
+  fetch_project:
+    probability: 1
+  push_for_review:
+    probability: 1
+  push_to_branch:
+    probability: 1
+  query_changes:
+    probability: 1
+  query_projects:
+    probability: 1
+  review_change:
+    probability: 1
diff --git a/container/tools/actions/create_project.py b/container/tools/actions/create_project.py
index 91fd8dc..5c8eece 100644
--- a/container/tools/actions/create_project.py
+++ b/container/tools/actions/create_project.py
@@ -23,7 +23,7 @@
 
 
 class CreateProjectAction(abstract.AbstractAction):
-    def __init__(self, url, user, pwd, probability=0.00002):
+    def __init__(self, url, user, pwd, probability=1):
         super().__init__(url, user, pwd, probability)
         self.project_name = self._get_random_project_name()
 
diff --git a/container/tools/actions/fetch_project.py b/container/tools/actions/fetch_project.py
index 3030293..9d6e416 100644
--- a/container/tools/actions/fetch_project.py
+++ b/container/tools/actions/fetch_project.py
@@ -22,7 +22,7 @@
 
 
 class FetchProjectAction(abstract.AbstractAction):
-    def __init__(self, project_name, probability=0.1):
+    def __init__(self, project_name, probability=1):
         super().__init__(url=None, user=None, pwd=None, probability=probability)
         self.project_name = project_name
 
diff --git a/container/tools/actions/push_for_review.py b/container/tools/actions/push_for_review.py
index bda2d41..8e5d77a 100644
--- a/container/tools/actions/push_for_review.py
+++ b/container/tools/actions/push_for_review.py
@@ -16,7 +16,7 @@
 
 
 class PushForReviewAction(abstract_push.AbstractPushAction):
-    def __init__(self, project_name, probability=0.2):
+    def __init__(self, project_name, probability=1):
         super().__init__("HEAD:refs/for/master", project_name, probability=probability)
 
     def _prepare(self):
diff --git a/container/tools/actions/push_to_branch.py b/container/tools/actions/push_to_branch.py
index 9762461..996bc46 100644
--- a/container/tools/actions/push_to_branch.py
+++ b/container/tools/actions/push_to_branch.py
@@ -17,7 +17,7 @@
 
 
 class PushToBranchAction(abstract_push.AbstractPushAction):
-    def __init__(self, project_name, probability=0.2):
+    def __init__(self, project_name, probability=1):
         super().__init__("HEAD:master", project_name, probability=probability)
 
     def _prepare(self):
diff --git a/container/tools/actions/query_change_files.py b/container/tools/actions/query_change_files.py
index c011401..f5c85ce 100644
--- a/container/tools/actions/query_change_files.py
+++ b/container/tools/actions/query_change_files.py
@@ -20,7 +20,7 @@
 
 
 class QueryChangeFilesAction(abstract.AbstractAction):
-    def __init__(self, change_id, url, user, pwd, probability=0.2):
+    def __init__(self, change_id, url, user, pwd, probability=1):
         super().__init__(url, user, pwd, probability)
         self.change_id = change_id
         self.revision_id = 1
diff --git a/container/tools/actions/query_changes.py b/container/tools/actions/query_changes.py
index a465021..f238365 100644
--- a/container/tools/actions/query_changes.py
+++ b/container/tools/actions/query_changes.py
@@ -21,9 +21,6 @@
 
 
 class QueryChangesAction(abstract.AbstractAction):
-    def __init__(self, url, user, pwd, probability=0.2):
-        super().__init__(url, user, pwd, probability)
-
     def _execute_action(self):
         rest_url = self._assemble_url()
         response = requests.get(rest_url, auth=(self.user, self.pwd))
diff --git a/container/tools/actions/query_projects.py b/container/tools/actions/query_projects.py
index 989f18d..5205a87 100644
--- a/container/tools/actions/query_projects.py
+++ b/container/tools/actions/query_projects.py
@@ -23,9 +23,6 @@
 
 
 class QueryProjectsAction(abstract.AbstractAction):
-    def __init__(self, url, user, pwd, probability=0.05):
-        super().__init__(url, user, pwd, probability)
-
     def _execute_action(self):
         selected_project = None
         rest_url = self._assemble_url()
diff --git a/container/tools/actions/review_change.py b/container/tools/actions/review_change.py
index 20db3bd..88df4a9 100644
--- a/container/tools/actions/review_change.py
+++ b/container/tools/actions/review_change.py
@@ -22,7 +22,7 @@
 
 # pylint: disable=W0703
 class ReviewChangeAction(abstract.AbstractAction):
-    def __init__(self, url, user, pwd, probability=0.3):
+    def __init__(self, url, user, pwd, probability=1):
         super().__init__(url, user, pwd, probability)
         self.change_id = self._get_change_id()
         self.revision_id = 1
diff --git a/container/tools/config/parser.py b/container/tools/config/parser.py
index 2e2466a..f370d23 100644
--- a/container/tools/config/parser.py
+++ b/container/tools/config/parser.py
@@ -19,6 +19,16 @@
 DEFAULTS = {
     "gerrit": {"url": None, "user": "admin", "password": "secret"},
     "testrun": {"duration": None},
+    "actions": {
+        "clone_project": {"probability": 1},
+        "create_project": {"probability": 1},
+        "fetch_project": {"probability": 1},
+        "push_for_review": {"probability": 1},
+        "push_to_branch": {"probability": 1},
+        "query_changes": {"probability": 1},
+        "query_projects": {"probability": 1},
+        "review_change": {"probability": 1},
+    },
 }
 
 ARG_TO_CONFIG_MAPPING = {
diff --git a/container/tools/start_test.py b/container/tools/start_test.py
index e504586..39ac5f6 100755
--- a/container/tools/start_test.py
+++ b/container/tools/start_test.py
@@ -40,6 +40,8 @@
             else None
         )
 
+        self.action_config = test_config["actions"]
+
         self.owned_projects = set()
         self.cloned_projects = set()
 
@@ -88,13 +90,23 @@
         return np.random.choice(input_list, 1, p=probabilities).tolist()[0]
 
     def _exec_create_project_action(self):
-        action = actions.CreateProjectAction(self.url, self.user, self.pwd)
+        action = actions.CreateProjectAction(
+            self.url,
+            self.user,
+            self.pwd,
+            self.action_config["create_project"]["probability"],
+        )
         project_name = action.execute()
         if not action.failed and project_name:
             self.owned_projects.add(project_name)
 
     def _exec_list_projects_action(self):
-        action = actions.QueryProjectsAction(self.url, self.user, self.pwd)
+        action = actions.QueryProjectsAction(
+            self.url,
+            self.user,
+            self.pwd,
+            self.action_config["query_projects"]["probability"],
+        )
         project_name = action.execute()
         if not action.failed and project_name:
             self.owned_projects.add(project_name)
@@ -105,6 +117,7 @@
             self.user,
             self.pwd,
             self._choose_from_list_poisson(list(self.owned_projects)),
+            self.action_config["clone_project"]["probability"],
         )
         action.execute()
         if not action.failed and action.was_executed:
@@ -112,28 +125,41 @@
 
     def _exec_fetch_project_action(self):
         action = actions.FetchProjectAction(
-            self._choose_from_list_poisson(list(self.cloned_projects))
+            self._choose_from_list_poisson(list(self.cloned_projects)),
+            self.action_config["fetch_project"]["probability"],
         )
         action.execute()
 
     def _exec_push_commit_action(self):
         action = actions.PushToBranchAction(
-            self._choose_from_list_poisson(list(self.cloned_projects))
+            self._choose_from_list_poisson(list(self.cloned_projects)),
+            self.action_config["push_to_branch"]["probability"],
         )
         action.execute()
 
     def _exec_push_change_action(self):
         action = actions.PushForReviewAction(
-            self._choose_from_list_poisson(list(self.cloned_projects))
+            self._choose_from_list_poisson(list(self.cloned_projects)),
+            self.action_config["push_for_review"]["probability"],
         )
         action.execute()
 
     def _exec_query_changes_action(self):
-        action = actions.QueryChangesAction(self.url, self.user, self.pwd)
+        action = actions.QueryChangesAction(
+            self.url,
+            self.user,
+            self.pwd,
+            self.action_config["query_changes"]["probability"],
+        )
         action.execute()
 
     def _exec_review_change_action(self):
-        action = actions.ReviewChangeAction(self.url, self.user, self.pwd)
+        action = actions.ReviewChangeAction(
+            self.url,
+            self.user,
+            self.pwd,
+            self.action_config["review_change"]["probability"],
+        )
         action.execute()